Railway signaling.



- To all whom it may concern:

n ne I HERBERT A WALLACE, or PITTSBURGH, PENNSYLVANIA, Ass GNoIt'To THEUNION SWITCH & sIGNAL oonrANY, or SWISSVALE, PENN Y VANIA; A CORPOR TIONon r PENNsYLvA IA.

RAILWAY SIGNALING.

Application filed January 12, 191 Serial No. 71,604.

Be it known that I, HERBERT railway switch or other traiiic controlling.

device.

. One object of my invention is-to' prov de means for the control of aswitch operatmg lever by a switch .or switches operated A. WALLACE, acitizen of the Unitedv States, residing at Pittsburgh, in the county ofAllegheny and thereby, jointly with the control of one or more signalsgoverning traffic over the corresponding switch or switches, by means ofa relay or-other electromagnetic translating device which isenergized'in one direction or the other according as the correspondingswitch is in one extreme position. or the other, and which is denergizedand short? circuited when the switch is in an intermedlate position. Thecontrol of the switch oper- .ating lever-is effected by means of one ormore looking or indication devices controlled by the relay which alsocontrols the signals, so that the, signals and the indication devicesdepend for their proper operation upon coincidence of position of the''more'of these signals 1s sometimes dispensed with, for instance,signals R and R are. sometimes combined into one signal which, whencleared, indicates to the engineer of an eastbound train that he mayproceed term route #l hereafter." However, when the switch is thrown tothe ,opposite position, a. e. reversed, it connects the branch E withtrack B, sojhat traflio'on track B passing eastwardly over the switch isdivertedto branch E and =vice versa, westbound traflic on branch Epasses over switch A to track B. This route, which comprises track B andbranch E, I shall term route #2. v

In order to govern traffic approaching the switch from either directionso that only one train can pass to the switch at a'time, I

. provide preferably four signals designated R R L and L of whichsignals R and R are shown mounted on thesame pole. Signal R governs thepassage of traflic from west to east over route #1 through theinterlocking limits,.which comprise that portion of the tracks extendingfrom signal R tosignal L and signal L governs the passageof traflic overthe same route in the opposite direction. Signal R governs the passageof a eastbound traific' through the interlocking llmi'ts .over route #2,and signal L governs traffic over this same route in theoppositedirection. These signals normally indie. cate stop and, as Ishall explain hereinafter, are controlledin' such manner that but oneslgnal at a time may be caused to displa a proceed indication orcleared,-so that ut one train may 'enter the interlocking territory at atime. Although I have shown four slgnals for governing traflic throughthe interlocking territory, in practice, one or through. theinterlocking territory, "but it does not indicate to him which one ofthe two routes has'been setup for him. These and similar changes arewell known and easily made by-thoseversed in the artandit In the drawingreference character B 'designates a straight portion of railway trackfrom which branches oif'another track E through a switchA or othertraffic control device. When this switch is in What I shall term itsnormal position (shown in the drawing) it completes the straight track Bso that traific on track B may pass over the switch from west toe-astwithout being deflected from the straightroute, which'I shall isunderstood that I do not wish to limit myself to the particulararrangement of signals and controlling circuits shown in .the

drawing.

Ifor the-operation and control of the switch I provide apparatus andcircuits similar to those described in Letters Patent No. 1,101,039lssued to G. R. Scattergood and .myself on June .23, 1914, although I donot wish to;limit myself to these particular circuits'and apparatus. Onthe drawing I have shown these circuits in dash lines for the purpose ofdistinction, the signal circuits connected with the switch rails bymeans of a rod 40. It will be seen that reciprocation. of the plunger 12will cause reverse movements of the switch A. Operatively connected withthe plate 37 is a pole-changer P for a'purpose which I will hereinafterexplain. Although I have herein shown this particular type of motordevice M, and actuating mechanism F, it is understood that I 'do notlimit myself to these particular types, but that any suitable motor andswitch actuating mechanism may be employed. I

The motor M is controlled by means of acircuit controlling lever G,which is usually one of a plurality of levers comprised in aninterlocking machine. This lever C may be of any suitable type; as hereshown it is of a usual and well knowntype comprising a shaft- 13 whichis adapted tooscillate and which operates a plurality of contact fingersone of which, designated 18, controls the circuit-s for the solenoids ofmotor M.

43 is a source of current which may be either direct or alternating, andwhich as here shown is a battery. In the arrangement of controlcircuits'herein showmone or the other of-the solenoids 10.01 11 isconnected with the source 43 according as contact finger 18 engages withcontact 45 or 4:4. It

is understood however that this arrangement of control of the motordevice M by the lever C is merely illustrative and that I do not wish tolimit myself to this particular arrangen'ient. The movements of theshaft 13 are as usual controlled by indication apparatus which, as hereshown, comprises two indication devices K and K one for each directionof movement. Each of these indication devices as here shown comprises asegment 27 fixed to the shaft 13 and provided with a dog 28 adapted toengage with u a latch 29, which latches are controlled by electromagnetsN and R respectively. Each of the electromagnets N and R is providedwith a circuit which is controlled by an electromagnetic device .D ashereinafter explained. The circuits for these indication magnets arealso controlled by contacts 25 and 26 operated by the shaft 13. Thesecon- 7 tacts are not moved during the first portion of the movement ofthe shaft 13 up to the point at which it is stopped by the dog 28 of oneor the other of'the indication devices,

of the shaft, the contacts 25 and 26 are re- 7 versed in position. Thisoperation of con tacts 25 and 26 is. as here shown'obtained by mountingthe contact fingers loosely on the shaft 13 andmoving them by pins 31,32, 33 v and 34: carried by collars 35 and 36 fixed on the shaft 13. Itis understood, however, that the meansherein shown for operating thecontacts 25-and 26 is merely illustrative, and that I do not limitmyself to this particular means.

The electromagnetic device D is a threeposition relay which may becontrolled by either alternating or direct current as described in theLetters Patent hereinbeforereferred to. When alternating current is usedto control this relay, the relay is preferably of a type in which thedirection of movement of the armature or rotor is obtained by thepolarity relation between currents in two windings, and in which thecontact fingers assume a middle position in case of no current or ofinsutiicient current in either or both windings. As here shown thisrelay is of a polyphase type comprising two windings, a and f and arotor 1", but I do not wish to limit myself to this particular type ofrelay. Rotor r operates contact fingers 60, 61 and 62; which cooperatewith fixed contacts 14, 15, 16 and 16. When the relay is energized sothat the fingers are swung to the left. (which I shall term the normalenergization of the relay), contacts 6014 and 62-16 are closed and whenthe relay is ener: gizedreveli'sely s that the contact fingers are swungto the right, contacts 611-5 and 6216 are closed. lVhen the relay isdeenergized or insufficiently energized so that the contact fingers arein the middle positlon, all contacts are open.

19 designates a source of alternating cur rent, here shown as being agenerator, to which are connected conductors 20. The. winding 7 of relayD is constantly energized from these conductors 20 through wires 21 and22..

T designates a transformer whose primary 41 is connected with conductors20 and. whose secondary 42 is connected with contact points l8, 49 and50 of pole changer P. The movable contact fingers 17 and 17 of thepolechanger P are connected with the winding a of relay D by wires 23 and24. It will be seen therefore that while the pole other, that is, whenthe switch actuating mechanism F occupies one extreme position or theother, the winding a is energized from transformer T in one direction orthe other relative to the energization of the winding 7, so that thecontact fingers of relay D then occupy one extreme position or; theother. \Vhen, however, the mechanism F is intermediate its two extremepositions,

changer P is in one extreme position or the 1,294,781 I is:

- g the contact fingers 17 and 17 of pole changer Pare disconnected fromtransformer T and v engage contacts 46 and 47 which are electricallyconnected by wire 51, so that the winding a is then disconnected fromthe transformer T and placed on the following short-circuitifromwindinga through wire 23,-contact finger 17, contactpoint 47, .wire

' 51, contact point46, contact finger 17, wire 24 to winding (1. Therotor 1' of relay D then assumes its middle position, so that all:

contacts 61-45- and 62-46 the relaycontacts are open. The shortcirouiting contacts 46 and 47 are added to shunt from the winding acurrent which might t'ated from its normal position shown in the drawingin the direction indicated by the arrow until the dog 28 of indicationdevice K engagesthe latch 2.9. In this position the contact finger 18has been disengaged from contact 44,-and has engaged contact 45, so

that solenoid 10 is energized through the following circuit; frombattery 43, through vwire 52, contacts 18 and- 45, wire 53, solenoid 10,wires 54, '56 and, 55. to battery 43.

This causes solenoid 10 todraw the plunger- 12 thereby shifting theplate 37 so that the roller 39 is moved by the cam slot 38 and theswitch A is reversed. As soon .as this movement begins and while theupper longitudinal portion of the slot 38i snoring past-the roller 39,the pole chamger ll is o.

erated so that its contact fingers 17 and 1 a.

disengage from-contact points 49 and 48 and engage with-contact ints 47and 46 thereby placing the win ing aofrelay .D on

short circuit so that all the contacts of this relay are then opened.The fingers 17 and- 17 of the pole changer continue to engage.

the points 47 and 46 while the switch A is being moved by the inclinedportion of the slot 38. When the movement-of the switch A is..c,ompleteand the lower longitudinal portion of the. slot 38 is moving past theroller 39 the contw fingers 17 and 17 are moved to engage with contactpoints 50 and g 49 thereby connecting windlnga with the transformer T inthe direction opposite to that shown .inthe'drawingi Relay D is nowenergized in the reverse direction-so that contacts,61-15 and 52%16 areclosed, The reverse indication magnet R .is' then .ener-- gized by theioilowihg circuit? from. bat tery 43, through wiresfifi and 56, contact.signals governing traffic over. I shall now explain.

- tact points.

15 61, wire 57, contact finger 25, wire 58, magnet- R, wires 59 and 52to battery 43. Magnet R then raises' its armature thereby raising thelatch 29 outof the path of dog .28 of indication device K so that themovement of shaft 13 can be continued until the lever arrives at itsreverse position.- During this last portion of the movement, contact .25

isopened, thereby opening the circuit for magnetR, and contact 26-isclosed thereby closing at that point the circuit for magnet N.

The operationof the. apparatus for the movement of the switch. A fromthe reverse I to the normal position would be similar to that justexplained, hence, it need not be eX- plained here in detail. v From theabove description of the apparatus for controlling the movement of theswitch it is evident that under ordinary con-- ditions lever C, relay Dand switch A occupy corresponding .positions; thus, when the switch isinthe normal position, lever C and relay D are also in their normalpositions and when the switch is reversed, lever (land relay D arealsoreversed. I utilize lever C and relay -D for the control of the theswitch as Reference character C designates a circuit controlling leversimilar to lever C, generally of the same interlocking machine, and

for purpose of distinction I shall hereinafter refer to lever C as thesignal lever and to lever C as the switch lever. Signal lever C occupiesnormally a middle position shown in'the drawing, in which ositioncontact fingers 75 and 76 operated y the lever are out of engagementwith their respective con-. When the lever is turned to the right, i.e.,' in the direction of the arrow marked 1', contact fingers 75and 76are brought into engagement with contact points 77 and 78 respectively.On the other hand,

when the lever is thrownto the left, as indicated by arrow 1, thesecontact fingers engage contact points 79 and 80 respectively.

The signals are governed by circuits whichare controlledby'these'contacts in conjunc 1 tlon with similar contacts on the switchlever C and alsoby contacts 16 and 16-of relay D.

Forexample, signal R? is controlled bythe 4 following circuit: frombattery 43, through. ,Wires. 55 and 56,- contact--62'16'of relay -D, 4

wire 81, contact.76-78 of the signal lever C, wire '82, contact 83 oftheswitc h lever C,

wire 84, si a1 R and wires 85 and 90 to battery 43. t follows that inorder to clear s gnal R thesignal lever C must be thrown .totheright,-relay D must be in the normal switch lever C must also be inthe normal position so that contact 83 closed. Similarly, the circuitfor slgnal L ris from battery 43, through wires 5:5 and 56,.cdntact-position so that contact 16 is. closed and 62-16 of relay D, wire 81,contact 768 of the signal lever C, wire- 86, contact 87 of the switchlever C, wire 88, signal L wires '89 and 90 to battery 43. It follows,there- 0 must be in the normal position. The circuit for signal R? iscompleted only when switch lever C and relay-D are reversed and signallever C is thrown to .the

' right, so that the following 'circuitisestablished: from-battery 43,through wires 55 and 56, contact 62 16 of relay D, wire 91,

contact 75' -77 ofsignal lever C, wire 97,

contact 98 of switch lever C, wire 94, signal R wires 95, 85 and 90 tobattery 43. On theyother hand, signalL is cleared only when switch leverC and'relay \D are reversed and signal lever C isthrown to the left, sothat the following circuit is closed: from battery 43, through wires 55and 56, contact 62'1'6 of relay D, wire 91, contact 7579 of signal leverC, wire 92, contact 93 of swjitchlever C, wire 99, signal L wires 89 and90 to battery 43.

Theopera-tion of the signals is easily understoodfrom the foregoingde'script-ion of the circuits. Suppose that the switch is in the normalpositiOn so that route #1 is es-' tablished. If the operator desirestopermit an eastbound train on track B to pass through the interlockingterritory via route #1, l e-clears signal R by throwing signal lever Cto the right. This closes at contact 7 6-7 8 the circuit forsignal Rtraced here- "inbefore, so that signal R is caused to indiate roceed. Atthis time the circuit for p signal L (which as pointed out hereinbeforegoverns traflic' over route #1 in the opposite direction) is open atcontact 80 of slgnal lever C, whichmakes it impossible'tofclear signal Las long as signal-R is in the pro-- ceed indi'cationso that no"opposingclear indication" can be given over the same route Thefcircuits forsignals'R and L are now openfat contact 62'.16 of rela'y D and contacts98 and '93 of switch lever Csothatit' is 'also-*impossible'fto' giveclear signals for- 50, s i .1

route #2, if y 1 W v In "order" to reverse the switclu the operatorfirst return signal lever C to its middle" or normal "position; Thisisn'ecessit-ated by "at-mechanicallocking arrangement which forms nopart of my invention and is well understood by those v'ersedii'n theart, so that I hav e'lhot shown it on the drawing.

lVhe I'i'signalleveritl returned to its nornial-"position, "contact"finger 7 3 breaks the circuit for signal R? so that this signal islllOllillO train may enter the'limits of the in- R and L and switchlever C closes the circuits for these signals at contacts 98 and 93respectively. The operator may now clear either signal R or L governingroute #2. I .If he desires to allow a westbound train on branch E topass through the'interlocking limits, heclears signal L by throwingsignal lever C tothe left so that contact finger 7 5 engages contactoint 79 and completes the circuit for signal L At this time the cir-'cult for opposing signal R is open at contact" 77 of signal lever Oso-that no opposing train on the s'ameroute may enter the inter--locking limits. Also the circuits of signals R and L governing route #1are open at contact 16 of relay D and contacts 83 and 87 of switch leverC, so that no train on route #1 may-enter the interlocking limits fromeitherend.

It is apparent from the above description ofthe signal circuitsthataft'er a certain route through the interlocking limits has beenestablished by the switch itv is possible to clear only either one ofthosefsignals whichgovern thatroute and it is impossible to clear eitherOf the signals which govern the other route. This selection isautomatically accomplished by the position of the switch lever C andrelay D and'theoperator has control of the'signals only in so. far as hemay select thedirection in which a train movement is to be made over theroute that has been established. This co-action of the.

switch lever and" relay Dis of great advantage the 'colltrol bf, thesignals in thatit constltutes a double check on the proper. relativepositions "of the switch lever and. the

switch before a signal for any route leading ov'ertheswitch may becleared; Although ord narily, both theasw'itch lever and the relay- Doccupy positions that correspond to the position of theswitch, it is notthe best;

practice to'rely on'only'one. Offihese means for the control v of thesignal, circuits, because it may happenthat either lever C or vrelay Ddoes not corresppnd to the position of'the switch. For 'ins'tanoe', the.operatorjmay throw-the swltchileverC until the latch .o'f the indicatlondevice preventsfurther move-c ment 'o'f the lever. The switch should nowrespond and give an indication of the com-v pletionjof its movementibyenergizing the indication magnet so' that the stroke I of. the

the indication apparatus is gout of 0rder,.11

are in non-corresponding positions. :Thisl lever may be completed. ,lf,due to .somey} derangement, the-switch .does, not move at ve hmusho ly-prt of i s stro 1 I y theoperator may, under the impressionlth" t .caused'to'ass'u ne the stop indication. Since the other signals are also inthe stop posi they can be wired easily andcheaply-in ,0, invent on.

condition may also be brought about by a manual operation of the switchactuating mechanlsm on the ground'-leaving the switch lever unmoved, sothat it does not correspond in position with the switch. But it is ofgreatest importance for the proper functioning of an interlockingmachinethat all switch levers always correspond in position-.with the switchescontrolled thereby, and if this condition of non-coincidence of theswitch lever and the switch should happenat an installation using thesignal control circuits of my invention, no clear signal could be givenover any route leading over 15 this switch because the correspondingsignal circuits would beopen at the contacts of the relay D-or at'thecontacts of lever C, The use of the relay' for the control of the signalcircuits is of great advantage because it permits of greater economy inthe use of wire than is possible when the signal control'circuits areled through the inter-- locking territory and are controlled bycontacts'directly operated by the switch movement, as is sometimes done.This is espe cially true of extensive and complicated in- -terlockingscomprising a great number of switches and crossovers, -where control. lof the signal circuits by contacts onthe switch gg iii'ivementsnecessitates a very complicated 1 1e? of I conductors vbetween thevarious switches and signals} So great,- indeed, is the length ofwirerequired in such interlockings that in general only [the signals 35for the high-speed routes are thus wired, Q leaving signals for'thea-low-s'peed routes without this protection. The partial protectionthus secured is insuflicient in the case of intersecting high-speed'andtlow-speed routes because a.'false clear signal for alowspeedroute-maypermit the pamage of a j low-speed train intoaor acrossan'oecupied I high-speed route, Even this partial protection .may'benullified by grounds on the 6 contacts operated by the switch movements.But in the use oi my inventio'n the relays controlled by the switchesare generally housed in a compartment of the interlocking. tower, sothat, without danger -from grounds,

such manner that each signal is governed by all the 'neeessary'switches'Although I- hare herem hownand dc scribed only'oneform and arrangementof signaling-circuits embodying myinvention,

itis understood that various changes-and modifications may be madethereinwithin the scope of the appended claims without departing ,fromthe spirit and scope of my .Havingthus described my invention, what iI'claim is: a

1. In combination,- a railway switch having a normal and a reverseposition, a relay mal and a reverse contact the former or the switch isin normal-or reverse position, a lever for controlhng' sa1d swltch andhaving a normal and a reverse posltion correspondlatter of which isclosed according as the ing to the said positions of the switch,'=fa

- normal and areverse contact operatediby sa1d lever and the former orthe latterlof WhlClLlS closed accordingasthe lever islin normal orreverse pOSltIOIl, two slgnals-g o'verning traflic over sa1d swltch, acircuit for;

one signal controlled by the'normal ,relay contact and the normal levercontact in series, and-a circuit for the other signal con-J.

trolled by: the reverse relay contact and'the reverse lever contact'inseries.

2. In combination, a r'ailway switch; relay, means .for governing therelay by the switeh,-a lever for controlling the switch, means forcontrolling the lever-by the rela a signal for overning trafiiciover'the' switc .l

and means or controllin relay and thc'le'ver.

(position, a switch lever having a normal an g the signal :bythe Incombination, a railwa' switch hav- .f -ing a normal and a reverseareverse esttion, means interposed between said l'evler.

and said switch for controlling said switc'ljr by said lever, ;a relaycontrolled by said i switch to assume a normal or a reverse posi-" thinresponsive to the position of said.

switch, and. si

gnaling means cbntr'olled by, sald relay. A- on ing'a normal and areverse position, a switch 4. I combination, a railwayi switch ham v vlever havinga normal and a reverse positions;

means interposed between said lever and said,

switch for controlling said switch by said lever, a relay controlled bysaid switch to assume a normal or 2; reverse position re spo'nsive tothe position of said switch, and signaling means controlled b' saidswitchlever.

5;"In oombin ing' a normal and a reverse position, a switch lever havinga normal and a reverse pos1- tion, "means-interposed between said leverysaid relay and;

ation 'a railway switch-havand'sai-d switch for controlling saidswitch,I

by said lever, a relay controlled by said switch to assume .a normal ora reverse posie tion responsive to the position of said switch;

indication; means controlled by said relay for preventing movement ofsaid lever into saidnormal'or reverseposition untii after said switchhas moved into .saidnormal or reverse position, a signal controlled bysaid. relay for governing 'traflic over sa1d switch, and meanscontrolled by the lever for preventing'said signal from being cleared.1111- less sa1d l'ever'and switch are incorresponding positions. v

. 6.111 combination, :a railway switch, a

lever for the control thereof, a signal, for

governing traiiic over the switch,'a locking" I65 controlled bysaid'switch and having a nordevice for restricting 'themfi'tsilient ofsaid 134;

lever, a relay responsive to said switch and energized by current of onepolarity 1n one extreme position of the switch and by current ofopposite polarity in the other, ex treme position of the switch, meansfor controllin said signal and said locking device I by sai relay, andmeans controlled by the lever for preventing said signal from beingcleared unless said lever and switch are in corresponding positions.

7. In combination, a railway switch having a normal and a reverseposition, a lever for controlling said switch and having a norto normalor reverse position until the switch mal and a reverse positioncorresponding to the said positions of the switclna; relay controlledbysaid switch and energized in normal or reverse direction according asthe switch is iii normal or reverse position, lever locking meanscontrolled by said relay for preventing complete movement of the leverhas completed its movement to the corresponding position in response toa partial movement of the lever, and a signal govern-" .25

coincidence in 'thepositions' of said lever ing trafiic over said switchand controlled 'by said relay and by said switch controlling lever.

8. In combination, a: railway switch, a lever for the control thereof, arelay controlled by said switch, an indication device controlled by saidrelay for controlling said lever, a signal for governing trafficoversaid' 1 switch, and means for governing said signal by said leverand'said relay sothat a proceed indication of said signal can be dis-"played only when said lever and said switch are in correspondingpositions. v

9. In combination, a railway sw tch 113V;

ing a normal and a: reverse position, a lever also having a normal and areverse position forv controlling said switch, a relayresponvsivejto'said positions of the switch, an inch-'- cation devicecontrolled bysaidrelay' for governingsaid lever, a signal for governingtraffic over said'switch; and means controlled by said relay andsaidlever for checking and 'sai'd switchbefor'e a proceed indication of'said signalc'an'b'e produced and maintained: 1 i i 4 l- 0lfIncombin'ati'on', a railway switch have ing. a" normal and areverse'position, a' relay controlled by sald switch-and having a nor malan'd iareverse contact the former or the latter ofl which is closedaccording as the switch in normal orreverse position, a

lever-"tor controlling said switch' and having a norina land a reverseposition correspond ingf'to the said positions ofthe switch, two

normal-and tworevere contacts operated by said lever the former beingclosed when theleverais in normal position and the latter be- 111g,closed when the lever is in reverseposit1on, a pair of signals governingtraffic over said switch in one direction and a pair of signalin .onedirection at a time.

signals governing tr-afiic over said switch in the other direction, acircuit for onesignal of one pair controlled by the normal relay contactand one normal lever contact, a circuit for one signal of the other paircon-.

11. In combination, two routes for railway v traffic, means i orcompleting one or the other of said routes, a lever, means interposedbetween said lever and'said first-mentioned means for controlling saidfirst-mentioned means by said lever, an electromagnetic translatingdevice responsive to reversals of current, means for controlling said'trans- V lating device by said first-'mentionedmeans,

.meansfor controlling said lever by said translating device, a circuitcontrolling lever,

ing trafli c over each route in both directions,

means for controlling the signaling means. for each route by said firstmentioned lever means for each route for governand by saidelectromagnetic controlling d e- I vice, and means for-furthercontrolling the signaling means for each route by said circuitcontrolling lever whereby traflic over'l either route is permittedto'proceed in but 12..In combination, two'rout'es' for rail. waytraffic, a switch for completing one" or the" other'of said routesaccording assaid switch is its normal or its reversed position, signalsfor each route one for eachdirection of traffic-over said route, acontrolling lever having a-normal and a reverse p0 sition, meansinterposed between said-lever correspond in position with saidcontrolling lever, a'rel'ay having a normal and a reverse pos1t1on,f1neans for causing said relay to "and said switcnfor causing saidswitch to correspondlin position with said switch,

means controlled by said rela'y-ifor preventing said controlling lever;fromass'nming Said normal or reverse position until afte said-switch hasbeen movedto its conesponding position, circuits for controlling saidsignals;-means controlled-by said circlos'ing partially the circuits "ofthe "signals governlng trafiic over the route completed for completingthe circuit of only one of the "cuit=controlling lever and said relayfor t by said switch, and'a signal contro'lling'lever "signals governingthe last mentioned route.

13. In combination, a railway traffio'cb11 trciling device, a-lever,means interposed be tween said lever and-said device for controllingsaid device by said lever, an electromag' netie translating deviceresponsive to rei versals of current, means for controlling-saidtranslating device by said railway traffic controlling device, means forcontrolling,

said lever by said translating device, signaling means for governingtraffic over said trafiic controlling device, and means for controllingsaid signaling means by said lever and said electromagnetic translatingdevice.

14. In combination, a railway trafiic controlling device, a lever, meansinterposed between said lever and said device for controlling saiddevice by said lever, an electromagnetic translating device responsiveto reversals of current, means for controlling said translating deviceby said railway traffic controlling device, means for controlling firstmentioned lever and said electromagnetic translating device.

In testimony whereof I aflix my signature 7 in presence of twowitnesses.

' HERBERT A. WALLACE. Witnessess A. O.'N0LTE, H. S. LooMIs.

